The first attack happened at an open pen at night when the zoo was closed, where a miniature stallion named Sweet William was killed. There was a pack of three dogs -- two of them German Shepherd mixes and one a Terrier.

"These dogs appeared to be on a mission, What's disturbing about this is it appeared they were looking for food," said San Jose Parks and Recreation Director Angel Rios Jr.Five nights later, the same dogs returned and dug under a steel fence where they mauled three female miniature horses to death. Their names were Spice Girl, Luna, and Cayenne. A Sicilian Donkey named Maybelline was also killed.

The city-owned facility had moved the horses and donkey to a safer compound with a six-foot high fence but there were no concrete or steel bars to keep them from digging under the fence. There will be now.

All five animals were popular attractions for thousands of young visitors to Happy Hollow Zoo. Staff attachment was strong. Their deaths have left deep psychological scars.